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use std::collections::HashMap;
use std::slice;
use crc::crc32;
#[ derive (Clone) ]
pub struct BtrfsDevice {
pointer: * const u8,
len: usize,
}
impl BtrfsDevice {
pub fn new (
pointer: * const u8,
len: usize,
) -> BtrfsDevice {
BtrfsDevice {
pointer: pointer,
len: len,
}
}
pub fn slice_at (
& self,
offset: usize,
len: usize,
) -> & [u8] {
if offset >= self.len {
panic! (
"Device slice start out of range: 0x{:x}",
offset);
}
if offset + len >= self.len {
panic! (
"Device slice end out of range: 0x{:x}",
offset + len);
}
unsafe {
slice::from_raw_parts (
self.pointer.offset (
offset as isize),
len,
)
}
}
pub fn pointer (& self) -> * const u8 {
self.pointer
}
pub fn len (& self) -> usize {
self.len
}
}
pub type BtrfsDeviceMap = HashMap <u64, BtrfsDevice>;
pub type BtrfsUuid = [u8; BTRFS_UUID_BYTES];
#[ repr (C, packed) ]
#[ derive (Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd) ]
pub struct BtrfsChecksum {
bytes: [u8; BTRFS_CHECKSUM_BYTES],
}
#[ repr (C, packed) ]
#[ derive (Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd) ]
pub struct BtrfsKey {
object_id: u64,
item_type: u8,
offset: u64,
}
#[ repr (C, packed) ]
#[ derive (Copy) ]
pub struct BtrfsLabel {
value: [u8; BTRFS_LABEL_BYTES],
}
impl BtrfsChecksum {
pub fn for_bytes (
bytes: & [u8],
) -> BtrfsChecksum {
let checksum_u32 =
crc32::checksum_castagnoli (
bytes);
BtrfsChecksum {
bytes: [
((checksum_u32 & 0x000000ff) >> 0) as u8,
((checksum_u32 & 0x0000ff00) >> 8) as u8,
((checksum_u32 & 0x00ff0000) >> 16) as u8,
((checksum_u32 & 0xff000000) >> 24) as u8,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
]
}
}
}
impl BtrfsKey {
pub fn object_id (& self) -> u64 {
self.object_id
}
pub fn item_type (& self) -> u8 {
self.item_type
}
pub fn offset (& self) -> u64 {
self.offset
}
}
impl Clone for BtrfsLabel {
fn clone (
& self,
) -> Self {
* self
}
}
pub const BTRFS_MAGIC: [u8; 0x8] = * b"_BHRfS_M";
pub const BTRFS_CHECKSUM_BYTES: usize = 0x20;
pub const BTRFS_UUID_BYTES: usize = 0x10;
pub const BTRFS_LABEL_BYTES: usize = 0x100;
pub const BTRFS_CHILD_UNKNOWN_TYPE: u8 = 0;
pub const BTRFS_CHILD_REGULAR_FILE_TYPE: u8 = 1;
pub const BTRFS_CHILD_DIRECTORY_TYPE: u8 = 2;
pub const BTRFS_CHILD_CHARACTER_DEVICE_TYPE: u8 = 3;
pub const BTRFS_CHILD_BLOCK_DEVICE_TYPE: u8 = 4;
pub const BTRFS_CHILD_FIFO_TYPE: u8 = 5;
pub const BTRFS_CHILD_SOCKET_TYPE: u8 = 6;
pub const BTRFS_CHILD_SYMBOLIC_LINK_TYPE: u8 = 7;
pub const BTRFS_CHILD_EXTENDED_ATTRIBUTE_TYPE: u8 = 8;